The difference in learning time between 20" and 24" wheels is 30%
(I've done the research). The significance of that is that if you
learn in a club and a variety of unicycles is available, pick the 20".
However, if you will learn on a unicycle you buy for yourself, the
consideration of your intended use overrides that of easy learning.
Tricks/Freestyle: 20". Distance/General Purpose/Mixed Use: 24".
For real distance riding, a 24" is smallish, but I would suggest not
attempting to learn riding on anything larger than 24" (although it
has been done even on a 36" Coker).
Klaas Bil - Newsgroup Addict
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"When it comes to the family jewels, you won't be having fun until they're having fun. - Jake D"